18c2ecf20Sopenharmony_ciC S+fencewmbonceonce+poacquireonce 28c2ecf20Sopenharmony_ci 38c2ecf20Sopenharmony_ci(* 48c2ecf20Sopenharmony_ci * Result: Never 58c2ecf20Sopenharmony_ci * 68c2ecf20Sopenharmony_ci * Can a smp_wmb(), instead of a release, and an acquire order a prior 78c2ecf20Sopenharmony_ci * store against a subsequent store? 88c2ecf20Sopenharmony_ci *) 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci{} 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ciP0(int *x, int *y) 138c2ecf20Sopenharmony_ci{ 148c2ecf20Sopenharmony_ci WRITE_ONCE(*x, 2); 158c2ecf20Sopenharmony_ci smp_wmb(); 168c2ecf20Sopenharmony_ci WRITE_ONCE(*y, 1); 178c2ecf20Sopenharmony_ci} 188c2ecf20Sopenharmony_ci 198c2ecf20Sopenharmony_ciP1(int *x, int *y) 208c2ecf20Sopenharmony_ci{ 218c2ecf20Sopenharmony_ci int r0; 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci r0 = smp_load_acquire(y); 248c2ecf20Sopenharmony_ci WRITE_ONCE(*x, 1); 258c2ecf20Sopenharmony_ci} 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ciexists (x=2 /\ 1:r0=1) 28